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China International Conference on Electricity Distribution, CICED

作者： Yibo Wang Kaipu Liu Chen Liu Yu Liu Zhanhui Du Yuan Wang the Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Northeast Electric Power University Jilin China

ISBN: (数字)9798350368345

ISBN: (纸本)9798350368352

Under the background of ‘double carbon’, the power system is facing green change, and the distribution network is facing the challenge of distributed generation and diversified load. Traditional distribution transformers are unable to cope with local load peaks and sudden load growth. In order to cope with the problem of heavy overload caused by seasonal load, mobile hybrid distribution transformer (MHDT) has gradually attracted attention as an innovative solution. In this paper, the deployment strategy of MHDT is discussed, and an optimization method based on spatial coordinate system mapping is proposed to reduce the amount of calculation and improve the computational efficiency. Through the practical application case of an agricultural irrigation area in Jilin Province, the actual effect of this method in solving the problem of transformer heavy overload is verified. The results show that MHDT can effectively improve flexibility response ability of distribution system.

关键词： Irrigation Optimization methods Distribution networks Transformers Emergency services Stability analysis power electronics Hybrid power systems Distributed power generation Reliability

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Cooperative control Strategy of Regional energy Storage and Thermal power Generation Considering Frequency Dynamic Response 9

Cooperative Control Strategy of Regional Energy Storage and ...

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9th Asia Conference on power and Electrical Engineering, ACPEE 2024

作者： Li, Junhui Yu, Zhenbo Zhao, Yang Ma, Jie Jiang, Xiaoliang Yu, Haozheng Zhu, Xingxu Li, Cuiping Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Jilin China State Grid Henan Electric Power Company Development Planning Department Zhengzhou China Planning and Assessment Centre State Grid Henan Electric Power Company Zhengzhou China

ISBN: (纸本)9798350309638

With the continuous promotion of the goal of 'carbon peak, carbon neutral', China is building a new type of power system in which the proportion of wind power/photovoltaic energy is gradually increasing, but the scenario of a high proportion of renewable energy will also bring the overall system frequency regulation pressure due to the shortage of frequency modulation(FM) capacity and other problems. This paper firstly quantifies the system frequency dynamic response(FDR) modeling under the scenario of high proportion of renewable energy, and derives the expression of the system overall frequency fluctuation characteristics;then according to the quantitative analysis results, it proposes the strategy of coordinating the conventional thermal power units with regional energy storage (ES) for joint frequency regulation, combining with regional ES for fast regulation and bidirectional response to meet the demand of system frequency regulation;finally, it carries out the case study with the northwestern regional grid, and the results show that the system frequency regulation reasonably meets the operational requirements and accurately verifies the validity of the proposed strategy. © 2024 IEEE.

关键词： Frequency response

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Excitation Current and Vibration Characteristics of DC Biased Transformer

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CSEE Journal of power and energy systems 2021年第3期7卷 604-613页

作者： Chao Pan Chengjian Wang Hao Su Key Laboratory of Modem Power System Simulation and Control&Renewable Energy Technology Ministry of Education(Northeast Electric Power University)Jilin 132012China

In practical engineering,DC disturbance will lead to excitation saturation and vibration intensification on transformer core,as well as affecting the normal operation of equipment and power *** to the problem,a new idea is proposed in this *** on the electromagnetic characteristics of DC biased transformer,excitation saturation and core vibration are studied by using excitation-vibration harmonic response analysis *** current is identified through electromagnetic coupling to characterize the excitation saturation ***,vibration harmonic response model is established to analyze core *** characteristics of DC biased Y/△transformer are *** variation of excitation current and core vibration at different DC levels are ***-vibration characteristics of three-phase group transformer and three-phase three-limb transformer are compared and *** experimental platform built,the correctness of simulation results is verified by experimental data,and the effectiveness of the proposed method can be proved.

关键词： DC disturbance excitation-vibration harmonic response Y/△transformer

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Research on Optimal Dispatching of Multi-energy Complementary system with Deep Peak Regulation 23

Research on Optimal Dispatching of Multi-energy Complementar...

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7th International Conference on High Performance Compilation, Computing and Communications, HP3C 2023

作者： Ma, Yuhan Ding, Shuo Ge, Xiaohui Zhao, Bo An, Yining State Grid Zhejiang Electric Power Co. Ltd. Research Institute Zhejiang Hangzhou China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Northeast Electric Power University Jilin Jilin China

ISBN: (纸本)9781450399883

The networked operation of multiple energy sources is gradually becoming the direction of future power system development. The optimal scheduling of the multi-energy network system is an important means to cope with the consumption of large-scale new energy connected to the grid. The cost model of wind power-photovoltaic-hydropower-thermal power-pumped storage combined generation system considering the depth peak regulation cost of thermal power units and the day-ahead optimal scheduling model of wind power-photovoltaic-hydropower-thermal power-pumped storage combined generation system considering the peak regulation initiative is established. A hierarchical optimal scheduling model is proposed to improve the absorption capacity of renewable energy and optimize the economic operation of thermal power units, to minimize the peak regulation cost and the amount of wind power abandonment of the system. The simulation examples show that the proposed model can realize the complementary operation of the combined power generation system, improve the depth peak regulation capacity of the thermal power units, and reduce the new energy abandonment rate and the system operation cost. © 2023 ACM.

关键词： Wind power

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Research and design of dual band microstrip filter 20

Research and design of dual band microstrip filter

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20th International Conference on Optical Communications and Networks, ICOCN 2022

作者： Zheng, Xuemei Zhou, Zhenxing Key Laboratory of Modern Power System Simulation and Control Renewable Energy Technology Jilin China School of Electrical Engineering Northeast Electric Power University Jilin China

ISBN: (数字)9781665458986

ISBN: (纸本)9781665458986

With the reduction of spectrum resources available in modern communication, higher requirements are put forward for the out of band suppression, frequency selection characteristics and signal-To-noise ratio of the filter. Based on the traditional stepped impedance resonator, a microstrip multifrequency filter based on open branch loaded stepped impedance resonator is designed and implemented in this paper. © 2022 IEEE.

关键词： Microstrip filters

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Design and optimization of mini MIMO antenna 20

Design and optimization of mini MIMO antenna

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20th International Conference on Optical Communications and Networks, ICOCN 2022

作者： Zheng, Xuemei Ma, Long Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Jilin China School of Electrical Engineering Northeast Electric Power University Jilin China

ISBN: (数字)9781665458986

ISBN: (纸本)9781665458986

This article designs three MIMO antennas for WLAN and WIMAX. The center resonance frequencies are 2.4 GHz, 3.5 GHz, and 5.2 GHz, respectively. The electromagnetic simulation software HFSS is used to design and optimize the MIMO antenna. The MIMO antenna is designed with dielectric substrates with different thicknesses and sizes and antenna element patches with different shapes. Use the antenna layout in each frequency band to obtain good isolation. Make the center working frequency reach more than 15dB. The antenna has the characteristics of omnidirectional radiation in the working frequency band, and the isolation and gain are calculated through the S parameter sweep frequency setting, and then the optimization function is used to optimize and modify the antenna. © 2022 IEEE.

关键词： Electromagnetic simulation

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Design of dual band microstrip antenna based on electromagnetic band gap structure 20

Design of dual band microstrip antenna based on electromagne...

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20th International Conference on Optical Communications and Networks, ICOCN 2022

作者： Zheng, Xuemei Tang, Longfei Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Jilin China School of Electrical Engineering Northeast Electric Power University Jilin China

ISBN: (数字)9781665458986

ISBN: (纸本)9781665458986

Because the antenna is an important passive component in the RF front-end of mobile communication, some studies have found that the combination of EBG and antenna can effectively improve the performance of the antenna. In this paper, a dual band microstrip antenna based on EBG structure is designed, which improves the gain of the antenna, and the resonant frequencies are 2.4 GHz and 3.5 GHz. After simulation, the return loss at two resonant frequencies is less than-19.5 dB, which basically meets the design requirements. © 2022 IEEE.

关键词： Natural frequencies

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Modeling of Direct Ac/Ac Hybrid Distribution Transformer Based on Relaxed Two Port Network Theory

SSRN

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SSRN 2024年

作者： Wang, Yibo Zhang, Xinyi Liu, Chuang Cai, Guowei Liu, Yu Liu, Kaipu Wang, Yuan Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Northeast Electric Power University Jilin132012 China

Traditional distribution transformers have shortcomings such as poor dynamic characteristics and unreasonable voltage compensation. It is difficult for them to meet the demand for power quality with large-scale integration of new energy into the grid. A hybrid distribution transformer (HDT) is one of the important means to address the above issues. It has good flexibility in voltage regulation and huge development potential. To analyze the operating status and losses of HDT, this paper constructs a simplified equivalent impedance model for HDT. Firstly, the operating principle, characteristics, and voltage regulation range of the direct AC/AC HDT are analyzed. Secondly, based on the state space averaging method, obtain the HDT single-phase average circuit topology and construct an HDT relaxed two-port network model. Thirdly, considering the operating losses of the transformer, derive the Thevenin equivalent parameters of HDT. Then, a simplified equivalent impedance model for HDT and the corresponding control strategies are given. Finally, verify the correctness and rationality of the proposed theory by building an HDT simulation model. © 2024, The Authors. All rights reserved.

关键词： Equivalent circuits

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Aggregation Modeling of system Frequency Response Under Inertia control of Grid-following Direct-drive Wind Turbine

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Dianli Xitong Zidonghua/Automation of Electric power systems 2025年第10期49卷 39-48页

作者： Jiang, Chao Yang, Dongfeng Guo, Shujia Liu, Xiaojun Zhou, Shuyu Cao, Zhichong Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin132012 China School of Automation and Electrical Engineering Zhejiang University of Science and Technology Hangzhou310023 China State Grid Jilin Electric Power Research Institute Changchun130000 China

The inertia control of grid-following direct-drive wind turbines significantly influences the system frequency response pattern afrer disturbances. However, current research has not clearly identified the dominant response link of direct-drive wind turbines in frequency regulation, while the modeling is too complicated to be suitable for frequency characteristic analysis. Therefore, the linearized models under inertia control are derived for two typical types of direct-drive wind turbines according to the aerodynamic equations, generator models, power control link, and control circuit structure. The fast physical process of current control-boost circuit/stator voltage dynamic loop is clearly understood and reasonably ignored. It is revealed that the two types of direct-drive wind turbines have a common frequency response mechanism which can be described as the cascade effect of the speed regulator-wind rotor motion equation. Furthermore, combined with the frequency response model of synchronous unit, the aggregation model of system frequency response under the inertia control of grid-following direct-drive wind turbines is constructed, and the aggregation model is reduced to a second-order model by the balance truncation method for analytical calculation of frequency extremes. The accuracy and applicability of the aggregation model and its reduced-order model are verified by MATLAB/Simulink simulation, and the influence of control parameters and system states on frequency dynamic characteristics and stability margin is analyzed. © 2025 Automation of Electric power systems Press. All rights reserved.

关键词： Electric power system control

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Evaluation Method of Distributed Photovoltaic Admission Capability Based on Voltage Sensitivity and Multi-Scenario power Flow simulation 5

Evaluation Method of Distributed Photovoltaic Admission Capa...

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5th IEEE International Electrical and energy Conference, CIEEC 2022

作者： Huangfu, Xiaowen Li, Qiuyan Ding, Yan Guo, Yong Zhao, Hanjie Li, Cuiping Sun, Dapeng Wang, Dongbo Hou, Xiangchen Fan, Jiangchuan Research Institute State Grid Henan Economic Zhengzhou China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Jilin China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

Under the Background of 'Carbon peaking and Carbon neutrality' goals, with the rapid development of clean energy, power system is gradually transforming to low-carbon. The proportion of distributed photovoltaic in the distribution network increases rapidly, and the uncertainty of its output and the randomness of the access scheme can easily lead to dramatic changes in line power flow and bring about operational safety problems. Aiming at the problem that high proportion of distributed photovoltaic access affects the safe and stable operation of distribution network, this paper proposes a distributed photovoltaic acceptance ability evaluation method based on voltage sensitivity and multi-scenario power flow simulation. The method uniformly generates the possible access scheme of distributed photovoltaic in the network and simulates the multi-power flow. Finally, by comparing the peak voltage of each scheme, the distributed photovoltaic carrying capacity of distribution network is evaluated. Taking IEEE 14-bus system as an example, the results show that the proposed method can effectively solve the calculation problem of distributed photovoltaic carrying capacity of distribution network. © 2022 IEEE.

关键词： Electric load flow

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